Why are polar bears endangered?

Because sea ice melts, polar bears can't find food. Polar bears depend on the arctic sea ice for food. With the melting of sea ice caused by climate warming, polar bears are forced to go to coastal areas to find food and feed their cubs, which may lead to a sharp decline in polar bear population. As early as 2040, many polar bears may face reproductive problems, which will lead to the extinction of polar bears in some areas. If the global greenhouse gas emissions remain unchanged, almost all polar bears will be extinct by 2 100. Peter molnar, a biologist at the University of Toronto, said, "Polar bears live at the top (northernmost) of the earth; If the sea ice disappears, they will have nowhere to go. " According to the Guardian, the study proposed two kinds of greenhouse gas emissions. The first is that if the emissions remain unchanged, by the end of 2 1 century, it is likely that only Queen Elizabeth Island in northern Canada will retain some polar bears. The second is that if greenhouse gas emissions are partially curbed, polar bears in the Arctic will still face reproductive difficulties by 2080. Stephen Armstrong, chief scientist of the Polar Bear International Association, told the BBC that the study found that "polar bear cubs will be difficult to survive, and even if they are born, their mothers will not have enough body fat to produce milk and breastfeed them in the ice-free season". The International Union for Conservation of Nature has long listed polar bears as "vulnerable" species, and pointed out that climate change is the main factor leading to the decline of this species.